An authentication device and associated system and method for authentication. The authentication device may be used to verify that a possessor thereof is authorized to receive a prearranged entitlement. The possessor may be entitled to a good or service, access to a location, a discount, etc. Verification...http://www.google.com.hk/patents/US20020116626?utm_source=gb-gplus-share專利 US20020116626 - Authentication system, method and apparatus
